IS 7016 (Part 9) :2003 ISO 5978:1990 W?dkTm mq-mwllkf m-wr@EFJTw@il . Fhwrq T-mEbl Ydaaf%15nmm=n `JTFT9 wq3wm*-a Indian Standard METHODS OF TEST FOR COATED AND TREATED FABRICS PART 9 RUBBER- OR PLASTICS-COATED FABRICS-- DETERMINATION OF BLOCKING RESISTANCE (Second ICS Revision ) 59.080.40 @ BIS 2003 BUREAU MANAK OF BHAVAN, INDIAN STANDARDS SHAH 110002 ZAFAR MARG 9 BAHADUR NEW DELHI June 2003 Price Group 1 Rubber and Rubber Products Sectional Committee, PCD 13 NATIONAL FOREWORD This Indian Standard (Part 9) (Second Revision) which is identical with ISO 5978:1990 `Rubberor plastics-coated fabrics -- Deterrnination of blocking resistance' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Rubber and Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council. This standard was first published in 1981 and revised in 1988. In the first revision the dimension of test piece, mass of weight-piece, requirements of air oven and time interval between manufacture and testing had been modified. Test procedure for determination of blocking resistance had been elaborated in order to make it more clear aligning with lSO/DIS 5978:1986 `Rubber-or plastics-coated fabrics -- Determination of blocking resistance'The Committee, therefore, decided to revise this standard to completely align with ISO 5978:1990. The text of ISO Standard has been proposed to be approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words `International be read as `Indian Standard'. Standard' appear referring to this standard, they should b) Comma (,) has been used as a decimal marker while in Indiah Standards, the current practice is to use a point (.) as the decimal marker. reference appears to the following International Standard for which no Indian In this adopted standard, Standard exists. ISO No. Title Rubber - or plastics-coated testing fabrics -- Standard atmospheres for conditioning and ISO 2231:1989 In case of ISO 2231:1989, the Committee, responsible for the preparation of this standard took cognizance of this standard and decided that it is acceptable for use in conjunction with this standard. For tropical countries like India, the standard 27 + 2°C and 65 * 5 percent respectively. temperature and the relative humidity shall be taken as IS 7016 (Part 9): 1S() 5978:1990 2003 Indian Standard METHODS PART OF TEST FOR COATED AND TREATED FABRICS OR PLASTICS-COATED FABRICS OF BLOCKING RESISTANCE -- 9 RUBBERDETERMINATION (Second Revision ) 1 Scope 4,2 Weight-piece, of mass 5,0 kg. This International Standard specifies a method for the determination of the resistance of rubber- or plastics-coated fabrics to blocking. The method specified is acceptable in most cases. If it is desired to use conditions other than those specified, these may be mutually agreed between the contracting parties but such variations shall be stated in the test report. 4.3 Circuiating-air oven, of such a size that the totai volume of the test assemblies does not exceed 10 Y. of the free space in the oven. Provision shall be made for placing the test assemblies on shelves so they are not less than 50 mm from each other or from the sides of the oven. The nature of the source of heat is optional but the source shali be located in the air supply of the oven. Provision shall be made for circulation of air through the oven at a rate such as t~ provide a minimum of six air changes per hour. the oven shaii be The temperature of thermostatically controlled to maintain the temperature of the test assemblies within *2 "C of the specified temperature. Baffles shall be used as required to prevent overheating and dead-spots. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2231:1989, Rubber- or plastics-coated fabrics -- Standard atmospheres for conditioning and testing. 5 Time interval between manufacture and testing 5.1 For all purposes, the minimum time between manufacture and testing shall be 16 h. 3 Definition Standard, the For the purposes of this International following definition applies. blocking: An unintentional terials. [Definition cabulary.] adherence between ma- taken from iSO 472:1988, P/astics ­ Vo- 5.2 For non-product tests, the maximum time between manufacture and testing shall be four weeks, and for evaluations intended to be comparable, the tests, as far as possibie, shaii be carried out affer the same time interval. 4 Apparatus approximately 4,1 Glass measuring plates, 150 mm x 150 mm x 3 mm. 5.3 For product tests, whenever possibie, the time between manufacture and testing shall not exceed three months. In other cases, tests shail be made within two months of the date of receipt by the customer. IS 7016 5978: (Part 9) :2003 1990 1s0 6 Samples and test pieces 6.4 Samples shall be taken not less than 1 m from the end of the roll. 6.2 The test pieces for each sample to be tested consist of six specimens, each shall 150 mm x 150 mm. 6.3 Test pieces shall be representative of the material being tested. They shall be taken from the working width of the sample. They shall be cut with one edge parallel to the longitudinal axis of the sample. The longitudinal the test pieces. and lateral axes shall be maked on 8.3 At the end of the. exposure period, remove the test-assembly from the oven, immediately take the test piece from between the plates and allow it to cool for 1 h. Then carefully separate the test pieces and examine them, for adherence or peeling of the coatings. 8.4 Rate the resistance of each blocking by the scale given below: test piece to 1 ­ No blocking: coated surfaces separate without any evidence of adhering. 2 ­ Slight blocking: some adherence of coated surfaces takes place on separation, but without detriment to the coating. .3 ­ Blocking: coated surfaces are difficult to separate; the coating or part of the coating is removed during separation. 7 Conditioning of test pieces 9 The test pieces shall be conditioned in one of the standard atmospheres as defined in ISO 2231. Test report partic- 8 Procedure The test reporl shall include the following ulars: a) a reference to this International Standard; 8.1 Arrange the test pieces in pairs, back to back, face to face and back to face, to form a pile 150 mm square. Place the test pieces thus arranged between two glass plates (4.1). Place the 5,0 kg weight-piece (4,2) on the top plate in a position to ensure an even distribution of pressure. 8.2 Expose the test assembly for 3 h at a temperature of 70 "C ~ 2 "C in the oven (4.3). b) all details necessary for the identification of the sample; conditioning c) the clause 7); atmosphere used (see d) the total mass on the test piece; e) the rating for resistance ance with 8.4; 9 to blocking, in accord- any departure from the procedure specified. 2 Bureau of Indian Standards institution established under the Bureau of Mian Standards Act, BIS is a statutory 1986 to promote certification of harmonious development of the activities of standardization, goods and attending to connected matters in the country. Copyright BIS has the copyright of implementing designations. Review of all its publications. marking and quality No part of these publications details, such as symbols to the Director may be reproduced and sizes, type in any form without the prior permission the standard, Enquiries in writing of BIS. This does not preclude the free use, in the course of necessary or grade be addressed (Publication), BIS. relating to copyright of Indian Standards Standards are also Amendments are issued to standards as the need arises on the basis of comments. reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments Monthly Additions'. or edition by referring to the latest issue of `BIS Catalogue' and `Standards: This Indian Standard has been developed Amendments Amend No. from Dot: No. PCD 13 (1989). 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